[wrangler] Add experimental support for declarative Durable Object exports

[petebacondarwin]

Fixes DEVX-2572.

Adds client-side wiring for the EWC declarative Durable Object exports flow.

What this adds

A new declarative exports map in wrangler.json / wrangler.toml as an alternative to the legacy migrations array, gated behind --experimental-do-exports (alias --x-do-exports):

{
	"exports": {
		"MyDO": { "type": "durable_object", "storage": "sqlite" },
		"OldGone": { "type": "deleted" },
		"OldName": { "type": "renamed", "renamed_to": "NewName" },
		"Movee": { "type": "transferred", "transferred_to_script": "target-worker" }
	}
}

Both wrangler deploy and wrangler versions upload send the new payload when the flag is on. The upload response's exports_reconciliation envelope is rendered with the spec's visibility hierarchy:

• errors → red ✘ per-class detail (rendered from the v4 envelope's meta.details[]), thrown as a UserError so every blocking scenario surfaces in one round trip
• warnings → yellow, prominent (reserved — no current server scenarios emit one)
• info → dim text, with per-entry blocked_by lists for stale tombstones
• removable_entries → single-line "you can delete these from exports" hint

Server dependencies

Requires the exports_reconciliation account entitlement on Cloudflare's side. Hidden behind an experimental flag until that gate ships broadly.

Server-side phases: DEVX-2563 (1a), DEVX-2598 (1b), DEVX-2564 (2), DEVX-2600 (1d). DEVX-2599 (1c) adds full transferred support — until that lands, the transferred tombstone returns a "not yet implemented" error from EWC, which is rendered correctly via the same meta.details path.

Coordinated with the new config redesign

The new @cloudflare/config package's exports.durableObject() is extended with tombstone factories (exports.deleted(), exports.renamed({ to }), exports.transferred({ toScript })) and a transferFrom option. The previous "Durable Object exports are not currently supported" throw in convertExports is replaced with a snake_case conversion that emits the wrangler config schema.

Spec

https://wiki.cfdata.org/spaces/WX/pages/1396640001

---

• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: customer-facing docs are tracked separately in DEVX-2569.

A picture of a cute animal (not mandatory, but encouraged)

[changeset-bot]

🦋 Changeset detected

Latest commit: be1facc

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

Name	Type
wrangler	Minor
@cloudflare/vite-plugin	Patch
@cloudflare/vitest-pool-workers	Patch
@cloudflare/wrangler-bundler	Patch

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commit: be1facc